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Some time ago I started to get into programming computers. There are books that teach programming languages. There are others that simply tell you what the commands are. They don't teach you how to program, but you can use the information to make your programs work. In a sense, programming books don't teach programming.
In a similar way, Cunningham's Encyclopedia of Magical Herbs doesn't teach you how to do spells (although it does give a brief outline so you can use this without any other book). What it does do is give you all the information you need to make your spells, talismans, amulets, and rituals work better.
This book has become a classic in its field. Every time I visit an occult shop that sells herbs, I look to see what books they use as resources. Inevitably, this book is there, usually quite beaten up from constant use. The pros use it and so do over 200,000 people like you.
The cross-referenced index of folk names could be a book by itself. Did you know that if a magical spell calls for "bats' wings" you should use holly? Or did you know that if a magical recipe called for "lapstones" you should use potato? If you had this book you would know all that and more. You'd also learn that ragweed can be used for courage; lily of the valley can enhance mental powers and happiness; and chrysanthemums can be used for protection.
This book by Scott Cunningham is truly encyclopedic. It gives information on over 400 herbs in an easy-to-use format that makes working with the book clear and simple. If you do any sort of magic with herbs, or if you are interested in folklore, this is a book you must have.